[XenPPC] One more fix for the forward port

[Christian Ehrhardt <ehrhardt@xxxxxxxxxxxxxxxxxx>]

Hi,
the following is a fix for powerpc page.h to be compliant to a 
i386&x86_64 xen change made in rev. 13546 and before. In our current 
task to port our ppc tree to the current 2.6.18 base this is just one 
more fix we need. It removed issues with "Bad Page State". A similar 
solution for ia64 was already done in 13868.
The DomU now boots without visible issues, but at least on my system 
networking in DomU does not yet work - the DomU tihnk its working, but I 
can't get a connection from/to Dom0.
@Hollis - currently you are the only one except me who has an up-to-date 
forward port patch queue - could you please verify if this is only an 
issue of my local setup by applying all my latest patches and see what 
works in your environment.
Background FYI - the issue looked like that (while booting a DomU with 
network):
[  305.530492] Bad page state in process 'swapper'
[  305.530493] page:c000000003d13400 flags:0x0040000000100400 
mapping:0000000000000000 mapcount:1 count:0
--

Grüsse / regards, 
Christian Ehrhardt
IBM Linux Technology Center, Open Virtualization
+49 7031/16-3385
Ehrhardt@xxxxxxxxxxxxxxxxxx
Ehrhardt@xxxxxxxxxx

IBM Deutschland Entwicklung GmbH
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Geschäftsführung: Herbert Kircher 
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Registergericht: Amtsgericht Stuttgart, HRB 243294

diff -r 3eeeeb79cfce include/asm-powerpc/page.h
--- a/include/asm-powerpc/page.h        Tue Jun 19 06:15:10 2007 +0200
+++ b/include/asm-powerpc/page.h        Tue Jun 19 06:46:39 2007 +0200
@@ -194,6 +194,15 @@ struct vm_area_struct;
 struct vm_area_struct;
 extern const char *arch_vma_name(struct vm_area_struct *vma);
 
+#define arch_free_page(_page, _order)       \
+({                      \
+       int foreign = PageForeign(_page);   \
+       if (foreign) \
+               PageForeignDestructor(_page);   \
+       foreign; \
+})
+#define HAVE_ARCH_FREE_PAGE
+
 #include <asm-generic/memory_model.h>
 #endif /* __ASSEMBLY__ */
 

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